[C3 HL-022] Add grounded AI proposals with provenance and evaluation #32

Outcome

Use AI for bounded compositional proposals that the artist can evaluate and select.

Placement and activation

• Circle: C3 — Composition studio and governed generative experiments
• System responsibilities: Assurance / Product
• Capability coverage: 01 Core Domain / Proprietary Engine; 04 Data Platform; 05 Identity, Security & Trust; 08 Quality, Testing & Evaluation
• Planning status: Conditional; activate only when the requirement below is met.
• Activation: A specific compositional question benefits from proposals; live inference requires a further documented artistic need.
• Parent epic: [EPIC C3] Composition studio and governed generative experiments #6; master roadmap: [MASTER EPIC] Hole-loop: concentric evolution within Persona / Visual Form Canon #2.

Dependencies

Requires selected source identities from #12, the minimal parameter/transform contract from #28 and an artist-reviewed question supported by relevant comparison evidence in #20 / #21.

#31 is a dependency only if proposals are created/reviewed through the composition studio. Offline scripts or manually reviewed proposals do not require a general studio. Live inference has its own explicit artistic/runtime/data gate.

Acceptance evidence

• Begin with offline proposals such as twenty spacing variants holding wording/order fixed, or motif links constrained to an annotated corpus; the baseline works without live inference.
• Record model/provider/version when available, prompt/configuration, input source IDs, output, costs/latency, accepted/rejected decisions, and derivative identity.
• Build golden fixtures, grounding/hallucination checks, prompt/agent regressions, behavior/constraint evaluations, relevant content/security evaluations, and human review.
• Reject source substitution, fabricated attribution, unapproved text mutation, and unsafe executable actions; generated proposals never silently become historical text.
• If live generation is justified, record data transfer/consent, API-secret isolation, latency/cost ceilings, rate limits, timeout/fallback, replay inputs, and an artist-approved reason for unreviewed output.

Completion and scope

Attach the actual artifact or commit, relevant verification, limitations, and an artist decision where a composition changes. This issue plans authorized work; creation does not claim implementation or deployment. Preserve independent work/source identities and private source boundaries. Repository creation requires the extraction evidence in HL-004 #13 and HL-045 #14.

Evidence gate

Name the transformation that fixed composition or a simpler deterministic rule cannot adequately test. Keep an untransformed baseline/source-reading view and a bounded inspectable prototype. Before/after comparison, constraints, input custody, versions, output provenance, cost/latency/failure limits and artist selection are the deliverable. Nothing here is implemented by the present static edition.